TRICKLE-DOWN GREATNESSThe Aero Race 5.0 Jersey is a significant leap forward in aerodynamics & weight but weve kept the 4.0 model in the line because its one of the most comfortable all-around jerseys weve ever made. & its still one of the most aero jerseys out there. Perfect fit & excellent moisture management with a nice fresh graphic. Saves Approx. 12 watts at 40 km/h compared to a normal race-fit jersey Velocity Dry fabric on front & shoulders for enhanced wicking & faster drying Full-length YKK® Camlock zipper Nervato fabric at arm holes for enhanced aerodynamics Silicone gripper elastic at waist Giro 3 arm elastic for flat aero fit